scholarly journals Seasonal and spatial variability of the size-resolved chemical composition of particulate matter (PM10) in the Los Angeles Basin

2005 ◽  
Vol 110 (D7) ◽  
Author(s):  
Satya B. Sardar
Keyword(s):  
Particulate Matter ◽  
Chemical Composition ◽  
Los Angeles ◽  
Spatial Variability ◽  
Los Angeles Basin

Diurnal Variations of Individual Organic Compound Constituents of Ultrafine and Accumulation Mode Particulate Matter in the Los Angeles Basin

2004 ◽  
Vol 38 (5) ◽  
pp. 1296-1304 ◽  
Author(s):  
Philip M Fine ◽  
Bhabesh Chakrabarti ◽  
Meg Krudysz ◽  
James J. Schauer ◽  
Constantinos Sioutas
Keyword(s):  
Particulate Matter ◽  
Los Angeles ◽  
Organic Compound ◽  
Diurnal Variations ◽  
Los Angeles Basin ◽  
Accumulation Mode

scholarly journals Space geodetic determination of spatial variability in relative sea level change, Los Angeles basin

2007 ◽  
Vol 34 (1) ◽  
Author(s):  
B. A. Brooks ◽  
M. A. Merrifield ◽  
J. Foster ◽  
C. L. Werner ◽  
F. Gomez ◽  
...  
Keyword(s):  
Los Angeles ◽  
Spatial Variability ◽  
Sea Level ◽  
Sea Level Change ◽  
Los Angeles Basin ◽  
Relative Sea Level ◽  
Level Change

scholarly journals Oxidative potential of coarse particulate matter (PM10–2.5) and its relation to water solubility and sources of trace elements and metals in the Los Angeles Basin

2015 ◽  
Vol 17 (12) ◽  
pp. 2110-2121 ◽  
Author(s):  
Farimah Shirmohammadi ◽  
Sina Hasheminassab ◽  
Dongbin Wang ◽  
Arian Saffari ◽  
James J. Schauer ◽  
...  
Keyword(s):  
Trace Elements ◽  
Particulate Matter ◽  
Los Angeles ◽  
Elemental Composition ◽  
Water Solubility ◽  
Los Angeles Basin ◽  
Oxidative Potential ◽  
Coarse Particulate Matter

Elemental composition of CPM was highly associated with ROS activity.

scholarly journals Particulate Matter Modeling in the Los Angeles Basin Using SAQM-AERO

2000 ◽  
Vol 50 (1) ◽  
pp. 32-42 ◽  
Author(s):  
Prasad Pai ◽  
Krishnakumar Vijayaraghavan ◽  
Christian Seigneur
Keyword(s):  
Particulate Matter ◽  
Los Angeles ◽  
Los Angeles Basin

scholarly journals Diurnal variation in the proinflammatory activity of urban fine particulate matter (PM2.5) by in vitro assays

F1000Research ◽  
2018 ◽  
Vol 7 ◽  
pp. 596
Author(s):  
Christopher Lovett ◽  
Mafalda Cacciottolo ◽  
Farimah Shirmohammadi ◽  
Amin Haghani ◽  
Todd E. Morgan ◽  
...  
Keyword(s):  
Particulate Matter ◽  
Chemical Composition ◽  
Los Angeles ◽  
Messenger Rna ◽  
Inflammatory Responses ◽  
Photochemical Oxidation ◽  
In Vitro Assays ◽  
Diurnal Changes ◽  
Proinflammatory Activity

Background: Ambient particulate matter (PM) smaller than 2.5 µm in diameter (PM2.5) undergoes diurnal changes in chemical composition due to photochemical oxidation. In this study we examine the relationships between oxidative activity and inflammatory responses associated with these diurnal chemical changes. Because secondary PM contains a higher fraction of oxidized PM species, we hypothesized that PM2.5 collected during afternoon hours would induce a greater inflammatory response than primary, morning PM2.5. Methods: Time-integrated aqueous slurry samples of ambient PM2.5 were collected using a direct aerosol-into-liquid collection system during defined morning and afternoon time periods. PM2.5 samples were collected for 5 weeks in the late summer (August-September) of 2016 at a central Los Angeles site. Morning samples, largely consisting of fresh primary traffic emissions (primary PM), were collected from 6-9am (am-PM2.5), and afternoon samples were collected from 12-4pm (pm-PM2.5), when PM composition is dominated by products of photochemical oxidation (secondary PM). The two diurnally phased PM2.5 slurries (am- and pm-PM2.5) were characterized for chemical composition and BV-2 microglia were assayed in vitro for oxidative and inflammatory gene responses. Results: Contrary to expectations, the am-PM2.5 slurry had more proinflammatory activity than the pm-PM2.5 slurry as revealed by nitric oxide (NO) induction, as well as the upregulation of proinflammatory cytokines IL-1β, IL-6, and CCL2 (MCP-1), as assessed by messenger RNA production. Conclusions: The diurnal differences observed in this study may be in part attributed to the greater content of transition metals and water-insoluble organic carbon (WIOC) of am-PM2.5 (primary PM) vs. pm-PM2.5 (secondary PM), as these two classes of compounds can increase PM2.5 toxicity.

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